<template>
    <div class="login_container">
        <div class="login_box">
            <!--img-->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!--form-->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!--users-->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
                </el-form-item>
                <!--passwords-->
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" prefix-icon="el-icon-s-cooperation" show-password></el-input>
                </el-form-item>
                <!--button-->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登入</el-button>
                    <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return {
            //登入表单的数据绑定对象
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            //表单的验证规则对象
            loginFormRules: {
                username: [
                    { required: true, message: '请输入登入名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }]
            }
        };
    },
    methods: {
        resetLoginForm(){
            //console.log(this)
            this.$refs.loginFormRef.resetFields();
        },
        login () {
            this.$refs.loginFormRef.validate(async valid => {
                if (!valid) return;
                const {data: res} = await this.$http.post("login", this.loginForm);
                if(res.meta.status !== 200) return this.$message.error("登入失败!");
                this.$message.success("登入成功!");
                //1.将登入成功之后的 token ，保存到客户端的 sessionStorage中
                // 1.1 项目中除了登入之外的其他API接口， 必须在登入之后才能访问
                // 1.2 token 只应当在当前网站打开期间生效， 所以将 token 保存在 sessionStorage 中
                window.sessionStorage.setItem('token', res.data.token);
                //2.通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push("/home");
            });
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid black;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px black;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: black;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns {
    display: flex;
    justify-content: flex-end;
}
</style>